It's possible that Gordon Levitt's recent involvement in DC Comic's Sandman film may have pushed him out of the running - or Rudd was the favored choice in the first place.

Rudd's comedic flair should fit well with Edgar Wright's style, even if the film is a superhero flick at-heart. It is currently rumored that Ant-Man will follow the later iteration of the character; a crook by the name of Scott Lang who steals the Ant-Man technology and becomes the hero.

It's been mentioned that Ant-Man currently has no tie-ins with the Avengers, so don't expect Rudd to appear alongside Robert Downey, Jr. just yet. However, things got murky when the Avengers sequel revealed villain Ultron, a robot created by original Ant-Man Hank Pym.